Question

what are the multiple of 7 between 40 and 90​

Answer 1

Answer:

42,49,56,63,70,77,84.

Step-by-step explanation:

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Answer 2

Answer:

40=7×5+5

90=7×12+6

So calculate 7×(6+7+8+…+12)

1+2+3+…+n=n2+n2

a+(a+1)+…+b=(1+2+3+…+b)−(1+2+3+…+(a−1))

7×(6×13−10×6)=126

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